A steel tube with 5 cm internal diameter, 7.6 cm outer diameter and k=15W/m °C is covered with an isolative covering of thickness 2 cm and k= 0.2 W/m °C. A hot gas at 330 °C with h = 400 W/m².°C flows inside the tube. The outer surface of the insulation is exposed to cooler air at 30 °C with h = 60 W/m².°C. Calculate the heat loss from the tube to the air for 10 m of the tube and the temperature drop in the insulation layer.
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- A steam is flowing through a 5.7 m long of steel tube that has inner and outer radii of r, = 0.015 and r, 0,024 m, and a thermal conductivity of 0.14 W/m.K. The steam and the outer surface of the tube is maintained at constant temperature of 150 °C and the air = 25 °C, h = 0.35 W/m2.k) is surrounding the tube. To prevent the outer surface of the steel from the environmental conditions, a material that has a thermal conductivity of 0.014 W/m.k is wrapped over the outer surface of the steel. What is the maximum heat transfer from the steam to the air (W)? NOTE: Enter your answer. Answer Air Th Steam Steel Tr 111 ToSteam at 350 °C flows through the stainless steel pipe with k=26 W/m.°C. The inner and outer diameters of the stainless steel pipe are 6.0 cm and 7.0 cm, respectively. The pipe is insulated from the outside with a 4.0 cm thick glass wool (k= 0.038 W/m.°C) and then a 3.0 cm thick k=0.25 W/m.K material. The insulated pipe is in the environment at 20 °C. The heat loss from the pipe occurs only by [natural convection+radiation]. Film heat transfer coefficient including the effects of [natural convection+radiation] in the insulated pipe is 30 W/m². is C. Calculate the heat transferred per unit pipe length since the film heat transfer coefficient defined according to the inner area of the pipe is 110 W/m².°C.A pipe 30 m long with an outer diameter of 75 mm is used to deliver steam at a rate of 2000 kg / hour. The vapor pressure is 198.53 kPa entering the pipe with a quality of 98%. The pipe needs to be insulated with a thermal conductivity of 0.2 W / (m K) so that the quality of the steam will only slightly decrease to 95%. The outer surface temperature of the insulation is assumed to be 25 ° C. Ignore resistance conductive of the pipe material and it is assumed that there is no pressure drop in the pipe. a. Determine the enthalpy of incoming vapor = AnswerkJ / kg. b. Determine the enthalpy of steam coming out = AnswerkJ / kg. c. Determine the vapor heat change / loss along the flow = Answerwatt. d. Specify the minimum required insulation thickness = Answercm.
- A steel tube with 5 cm ID, 7.6 cm OD and k = 15 W/m °C is covered with an insulative covering of thickness 2 cm and k = 0.2 W/m °C. A hot gas at 330 °C with h= 400 W/m² °C flows inside the tube. The outer surface of the insulation is exposed to cooler air at 30 °C with h = 60 W²/m °C. Calculate the heat loss from the tube to the air for 10 m of the tube and the temperature drops resulting from the thermal resistances of the hot gas flow, the steel tube, the insulation layer, and the outside air. (Ans: q/L=7451.72 W; AT₁=11.859 °C; AT₂=3.31 °C; AT₁=250.75 °C; AT₁= 34.07 °C)A pipe 30 m long with an outer diameter of 75 mm is used to deliver steam at a rate of 1500 kg / hour. The vapor pressure is 198.53 kPa entering the pipe with a quality of 98%. The pipe needs to be insulated with a thermal conductivity of 0.2 W / (m K) so that the quality of the steam will only slightly decrease to 95%. The outer surface temperature of the insulation is assumed to be 25 ° C. Ignore resistance conductive of the pipe material and it is assumed that there is no pressure drop in the pipe. a. Determine the enthalpy of incoming vapor = Answer kJ / kg. b. Determine the enthalpy of steam coming out = Answer kJ / kg. c. Determine the vapor heat change / loss along the flow = Answer watt. d. Specify the minimum required insulation thickness = Answer cm.A thick-walled cylindrical tubing of hard rubber (k=0.151 W/m*K) having an inside radius of 5 mm and an outside radius of 20 mm is being used as a temporary cooling coil in a bath. Ice water is flowing rapidly inside, and the inside wall temperature is 275 K. The outside surface temperature is 300 K. A total of 20 W must be removed from the bath by the cooling coil. How many meter of tubing are needed?
- A pipe 30 m long with an outer diameter of 75 mm is used to carry steam at a rate of 1000 kg / hour. The vapor pressure is 198.53 kPa entering the pipe with a quality of 98%. The pipe needs to be insulated with a thermal conductivity of 0.2 W / (m K) so that the quality of the steam will only slightly decrease to 95%. The outer surface temperature of the insulation is assumed to be 25 ° C. Ignore resistance conductive of the pipe material and it is assumed that there is no pressure drop in the pipe. a. Determine the enthalpy of incoming vapor = Answer kJ / kg. b. Determine the enthalpy of steam coming out = Answer kJ / kg. c. Determine the vapor heat change / loss along the flow = Answer watt. d. Specify the minimum required insulation thickness = Answer cm.The wall of a 5 m high cylinderical steel tank (ks= 20 W/mK) of inner diameter 1.5 m and 200 mm thick contains hot oil at 100 C. On the outside of the tank 12 mm of spray urethane insulation is added to stop the oil from cooling. If the worst outside temperature is -6 , (hi = 16 W/m^2 K) and (ho = 5 W/m^2 K) how much heat needs to be added to keep the tank at 100 C for pumping reasons and what are the overall heat transfer coefficients Uo and Ui?A type 316 stainless steel pipe has a 6 cm inside diameter and an 8 cm outside diameter with a 2 mm layer of 85% magnesia insula- tion around it. Liquid at 112°C flows inside with h = 346 W/m²K. The air around the pipe is at 20°C, and h, = 6 W/m²K. Calculate U based on the inside area. Sketch the equivalent electrical circuit, showing all known temperatures. Discuss the results and suggest an improved design. [To = 96.36°C] %3D
- A 10 cm thick and 1 m wide long steel plate is immersed in an oil bath at T0=40°C when the temperature is T1=240 ° C. Heat transfer coefficient between plate and oil is h=600 W/m2K and p=7833 kg/m3 for steel, cp=465 J/kgK, k=43 W/mK, (alpha) = 1.2x10^(-5) m2/s. A) After how long the core temperature of the steel plate becomes 100 ° C. B) What is the temperature inside 3 cm from the surface of the steel plate happens. C) Within this period, per unit length plate what is the amount of heat that passes.As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 2. Ts.2} 1. Ts,1} Steam Insulation (a) If the insulation is 22.5 mm thick and its inner and outer surfaces are maintained at T1 = 800 K and T,2 = 490 K, respectively, what is the rate of heat loss per unit length (d) of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (q), in W/m, and outer surface temperature T, 2, in K, for the steam pipe with the inner surface temperature fixed at T,1 = 800 K, inner radius ri = 0.06 m, and outer radius r2 = 0.08 m. The outer surface is exposed to an airflow (T = 25°C) that maintains a convection coefficient of h = 25 W/m2-K and to large surroundings for which Tsur = T = 25°C. The surface emissivity of calcium silicate is approximately 0.8.A steel plate of thermal conductivity 50 W/mK and thickness 10 cm passes a heat flux of 30 kW/m2 by con- duction if the temperature of the hot surface is 100°C then what is the temperature of the cooler side of the plate (A) 40°C (С) 60°C (В) 50°C (D) 70°C